package test.DigitalDisgn;
import java.security.MessageDigest;  

import javax.crypto.KeyGenerator;  
import javax.crypto.Mac;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;
  
import sun.misc.BASE64Decoder;  
import sun.misc.BASE64Encoder;  
  
/** 
 * 基础加密组件 
 *  sig的加密算法为HMAC-SHA1
 * @author dengqi 
 * @version 1.0 
 * @since 1.0 
 */  
public abstract class Coder {  
    public static final String KEY_SHA = "SHA";  
    public static final String KEY_MD5 = "MD5";  
    public static final char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f' };
  
    /** 
     * MAC算法可选以下多种算法 
     *  
     * <pre> 
     * HmacMD5  
     * HmacSHA1  
     * HmacSHA256  
     * HmacSHA384  
     * HmacSHA512 
     * </pre> 
     */  
    public static final String KEY_MAC = "HmacSHA1";  
  
    /** 
     * BASE64解密 
     *  
     * @param key 
     * @return 
     * @throws Exception 
     */  
    public static byte[] decryptBASE64(String key) throws Exception {  
        return (new BASE64Decoder()).decodeBuffer(key);  
    }  
  
    /** 
     * BASE64加密 
     *  
     * @param key 
     * @return 
     * @throws Exception 
     */  
    public static String encryptBASE64(byte[] key) throws Exception {  
        return (new BASE64Encoder()).encodeBuffer(key);  
    }  
  
    /** 
     * MD5加密 
     *  
     * @param data 
     * @return 
     * @throws Exception 
     */  
    public static String encryptMD5(byte[] data) throws Exception {  
            MessageDigest mdTemp = MessageDigest.getInstance(KEY_MD5);
            mdTemp.update(data);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
    }  
  
    /** 
     * SHA加密 
     *  
     * @param data 
     * @return 
     * @throws Exception 
     */  
    public static byte[] encryptSHA(byte[] data) throws Exception {  
  
        MessageDigest sha = MessageDigest.getInstance(KEY_SHA);  
        sha.update(data);  
  
        return sha.digest();  
  
    }  
  
    /** 
     * 初始化HMAC密钥 
     *  
     * @return 
     * @throws Exception 
     */  
    public static String initMacKey() throws Exception {  
        KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);  
  
        SecretKey secretKey = keyGenerator.generateKey();  
        return encryptBASE64(secretKey.getEncoded());  
    }  
	  
	    /** 
	     * HMAC加密 
	     *  
	     * @param data 
	     * @param key 
	     * @return 
	     * @throws Exception 
	     */  
	    public static byte[] encryptHMAC(byte[] data, String key) throws Exception {  
	  
	        SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);  
	        Mac mac = Mac.getInstance(secretKey.getAlgorithm());  
	        mac.init(secretKey);  
	  
	        return mac.doFinal(data);  
	  
	    }  
	    public static void main(String[] args) {
	 	        try {
					System.out.println();
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} 
		}
	} 

